Using the START command to invoke GTF

The START command, without any parameters other than the IBM-supplied procedure name and an identifier, uses the defaults of the cataloged procedure. If that source JCL contains a DD statement for the data set member of predefined trace options, GTF will issue a message that lists those options, and will allow you to override them. Otherwise, GTF will prompt you to specify trace options directly through the console. See Specifying or changing GTF trace options through system prompting for more information.

To invoke GTF, enter the following START command. For information about the command and parameters you can use to change the GTF cataloged procedure, see z/OS MVS System Commands.

{START|S}{GTF|membername}[.identifier]